A5002909225- Marine and coastal ecosystems
- Methane Hydrates and Related Phenomena
- Oceanographic and Atmospheric Processes
- Analytical Chemistry and Sensors
- Atmospheric and Environmental Gas Dynamics
- Water Quality Monitoring and Analysis
- Geology and Paleoclimatology Research
- Ocean Acidification Effects and Responses
- Water Quality Monitoring Technologies
- Hydrocarbon exploration and reservoir analysis
- Marine Biology and Ecology Research
- Geological Modeling and Analysis
- Offshore Engineering and Technologies
- earthquake and tectonic studies
- Atmospheric chemistry and aerosols
- Gas Sensing Nanomaterials and Sensors
- CO2 Sequestration and Geologic Interactions
- Groundwater and Isotope Geochemistry
- Underwater Acoustics Research
- Electrochemical Analysis and Applications
- Seismic Waves and Analysis
- Isotope Analysis in Ecology
- Seismology and Earthquake Studies
- Flow Measurement and Analysis
- Coastal and Marine Dynamics
Monterey Bay Aquarium Research Institute
2010-2022
Oceanography Society
2017
Florida State University
2008
University of North Carolina at Chapel Hill
2008
University of Mississippi
2008
University of California, Santa Barbara
1998
California State University, Monterey Bay
1998
University of Washington
1988-1996
Institut Jacques Monod
1983
Université Paris Cité
1983
Abstract The Southern Ocean Carbon and Climate Observations Modeling (SOCCOM) program has begun deploying a large array of biogeochemical sensors on profiling floats in the Ocean. As February 2016, 86 have been deployed. Here focus is 56 with quality‐controlled adjusted data that water at least 6 months. carry oxygen, nitrate, pH, chlorophyll fluorescence, optical backscatter sensors. raw generated by these can suffer from inaccurate initial calibrations sensor drift over time. Procedures to...
Increasing atmospheric carbon dioxide is driving a long-term decrease in ocean pH which superimposed on daily to seasonal variability. These changes impact ecosystem processes, and they serve as record of metabolism. However, the temporal variability observed at only few locations because ship required support observations sufficient precision accuracy. This paper describes pressure tolerant Ion Sensitive Field Effect Transistor sensor that based Honeywell Durafet ISFET die. When combined...
Abstract Reagent-free optical nitrate sensors [in situ ultraviolet spectrophotometer (ISUS)] can be used to detect throughout most of the ocean. Although sensor is a relatively high-power device when operated continuously (7.5 W typical), instrument in low-power mode, where individual measurements require only few seconds time and system consumes 45 J energy per measurement. Operation this mode has enabled integration ISUS with Teledyne Webb Research's Autonomous Profiling Explorer (APEX)...
Hurricane Felix passed over the Bermuda testbed mooring on 15 August 1995, providing a unique opportunity to observe response of upper ocean hurricane. In vicinity Bermuda, was particularly large hurricane with hurricane-force winds diameter about 300–400 km and tropical storm–force 650–800 km. moved northwestward at 25 h−1 eye passing 65 southwest August. Peak reached 135 mooring. Complementary satellite sea surface temperature maps show that swath cooler water (by 3.5°–4.0°C) left in wake...
Abstract Six profiling floats equipped with nitrate and oxygen sensors were deployed at Ocean Station P in the Gulf of Alaska. The resulting six calendar years 10 float data used to determine an average annual cycle for net community production (NCP) top 35 m water column. NCP became positive February as soon mixing activity surface layer began weaken, but nearly 3 months before traditionally defined mixed shoal from its winter time maximum. displayed two maxima, one toward end May another...
A recent analysis of full water column hydrographic data revealed a pH-dependent discrepancy between spectrophotometrically measured pH using purified meta-cresol purple and calculated from dissolved inorganic carbon (DIC) total alkalinity (TA). The (pHspec – pHTA,DIC) is approximately −0.018 0.014 at 7.4 8.2, respectively. This has wide range implications for marine measurements, such as establishing robust calibration protocols sensors operating on profiling floats. Here, we conducted...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubmersible, Osmotically Pumped Analyzer for Continuous Determination of Nitrate in situHans W. Jannasch, Kenneth S. Johnson, and Carole M. SakamotoCite this: Anal. Chem. 1994, 66, 20, 3352–3361Publication Date (Print):October 15, 1994Publication History Published online1 May 2002Published inissue 15 October 1994https://pubs.acs.org/doi/10.1021/ac00092a011https://doi.org/10.1021/ac00092a011research-articleACS PublicationsRequest reuse...
Long‐term osmotically pumped fluid samplers, or OsmoSamplers, were developed to reliably and autonomously collect continuous small‐volume water samples for monitoring aqueous environments in remote locations up several years. OsmoSamplers provide sequential milliliter‐size that, when analyzed, yield high‐resolution time‐series a wide range of dissolved components. These instruments fill an important niche that has not been addressed by automated samplers situ analyzers. can be customized...
Nitrate concentrations, chlorophyll a (Chl ) fluorescence, radiance, salinity, and temperature were measured on the Hawaii Air‐Sea Logging Experiment, A Long‐Term Oligotrophic Habitat Assessment (HALE ALOHA) mooring located near Ocean Time‐Series (HOT) Program's Station ALOHA (22°45′N; 158°W). concentrations determined with OsmoAnalyzers deployed at depths of 120 180 m. Deployments in 1997 1999 captured monthlong events that brought relatively cold high‐nitrate seawater up into euphotic...
Integrated Ocean Drilling Program (IODP) Hole 1301A was drilled, cased, and instrumented with a long‐term, subseafloor observatory (CORK) on the eastern flank of Juan de Fuca Ridge in summer 2004. This borehole is located 1 km south ODP 1026B 5 north Baby Bare outcrop. penetrates 262 m sediment 108 uppermost 3.5 Ma basaltic basement an area warm (64°C) hydrothermal circulation. The instrumented, those instruments were recovered 4 years later. Here we report chemical data from two continuous...
The Integrated Ocean Drilling Program (IODP) Hole 1301A on the eastern flank of Juan de Fuca Ridge was used in first long-term deployment microbial enrichment flow cells using osmotically driven pumps a subseafloor borehole.Three novel colonization systems with unidirectional were deployed borehole and incubated for 4 years to determine preferences 12 minerals glasses present igneous rocks.Following recovery systems, we measured cell density by fluorescent staining direct counting found some...
A telemetering electronics/control unit (OASIS) has been developed for use on moorings and free-floating drifters. The OASIS controllers are part of a long-term “coastal ocean observatory,” consisting an infrastructure ships, submersibles, array remote sensing platforms (moorings, drifters), communication links between sensors laboratory, data management facilities. controller coordinates retrieval from varying up to 28 oceanographic sensors, which may output digital, analog, or frequency...
For at least 9 years prior to July 1996, hydrothermal fluids flowed from Pele's Vents on Loihi Seamount, Hawaii. In July–August 1996 a tectonic‐volcanic event occurred that destroyed Vents, creating pit crater (Pele's Pit) and several sites with venting. October we deployed two new continuous water samplers (OsmoSamplers) of these collected using traditional sampling techniques monitor the evolution crustal conditions after event. The were recovered in September 1997, additional discrete...